Alright, let's work through 9899 times 6458 step by step
9899 × 6458 = 6458 × (9899)
+ 6458 × 9 what gives us 58122
+ 6458 × 90 producing 581220
+ 6458 × 800 which equals 5166400
+ 6458 × 9000 that is equal 58122000

= 63927742
